Takashi Shimura
Dr. Yamane
Akihiko Hirata
Dr. Serizawa
Fuyuki Murakami
Dr. Tabata
Tadashi Okabe
Dr. Tabata's Assistant
Toranosuke Ogawa
President of Company
Frank Iwanaga
Security Officer Tomo Iwanaga
Sammee Tong
Dr. Yamane / Dr. Tabata (voice) (uncredited)
James Hong
Ogata / Dr. Serizawa / Hagiwara (voice) (uncredited)
Mikel Conrad
George Lawrence (uncredited)
Paul Frees
Unidentified Character (voice) (uncredited)
Hiroshi Hayashi
Chairman of Diet Committee (uncredited)
Ren Imaizumi
Radio Operator (uncredited)
Kokuten Kōdō
The Old Fisherman (uncredited)
Takeo Oikawa
Chief of Emergency Headquarters (uncredited)
Tsuruko Mano
The Boy's Mother (uncredited)
Kenji Sahara
Man on Boat (uncredited)
Kin Sugai
Ozawa-san (uncredited)
Lee Miller
Man in Line at Airport (uncredited)
Haruo Nakajima
Godzilla (uncredited)
Katsumi Tezuka
Godzilla (uncredited)
Ryosaku Takasugi
Godzilla (uncredited)
